I will do API integration and development

It's ok. Just let me know what your business do and how it functions (If you can give links or documentations it would be great). And send me a documentation of the API you need integrated. I will check on the information given and suggest you the best way they can work together

It depends on what you need. If you have a web site/app and need an API integrated in to that directly we can use the same hosting server. But if you need two 3rd party services integrated together using their API's it may require a dedicated or VPS hosting server.

I need all the access details to the related services and access to their API keys. And if API documentation is not available online you may need to provide the documentation files too.

The situation change from case to case. For example if the API integration was done on AWS api gateway, transferring it to a normal hosting environment require full redesigning due to changes of architecture. Other wise changing from one hosting to another may only require very small tweaks.

If they upgrade and stop supporting the current version, we would have to address the changed architecture and it might require you to order more Gigs depending on the scale of the upgrade. Other wise if they continue to support the old version of the API it won't be an issue.